The simplest proxy server written in Ruby

simplest_proxy.rb

myport = 80
hostname = 'xxx.xxx.xxx.xxx'
port = 80

server = TCPServer.open(myport)

while true
  Thread.start(server.accept) do |client|
    s = TCPSocket.open(hostname, port)
    req_content_length = 0
    while line = client.gets
      line.gsub!('google.cn','google.com')
      puts line if (line.include?('GET') || line.include?('POST'))
      s.puts line
      req_content_length = line.split(':')[1].to_i if line.include? 'Content-Length'
      break if line.eql?("\r\n")
    end
    s.puts client.read(req_content_length) if (req_content_length > 0)
    puts '-----------------------------'
    is_chunk = false
    res_content_length = 0
    while res_head_line = s.gets
      res_content_length = res_head_line.split(':')[1].to_i if res_head_line.include? 'Content-Length'
      is_chunk = true if res_head_line.strip.downcase.include? 'transfer-encoding: chunked'
      client.puts res_head_line
      puts res_head_line
      break if res_head_line.eql?("\r\n")
    end
    if is_chunk
      chunk_size = s.gets
      client.puts chunk_size
      while(chunk_size.hex > 0)
        client.puts s.read(chunk_size.hex)
        client.puts s.gets
        chunk_size = s.gets
        client.puts chunk_size
      end
    else
      client.puts s.read(res_content_length) if (res_content_length > 0)
    end
    client.close
  end
end